#include <bits/stdc++.h>
using namespace std;
#define PI 3.1415926
#define   SQUARE(x) ((x)*(x))
//double SQUARE(double x) { return x*x;}

int main()
{
	int n,  y;
	double x;
	char c;
	scanf("%c",  &c);

  printf("%s", c % 2 ? "YES" : "NO");



  return 0;
}
